Error, (in Units:-RemoveSystem) the system SI of units is currently set to the default (see ?UseSystem) - Maple Help

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Units

 RemoveSystem
 remove a system of units

 Calling Sequence RemoveSystem(system)

Parameters

 system - symbol; name of system of units

Description

 • The RemoveSystem(system) function removes a system of units.
 • A system cannot be removed if it is the default system.

Examples

 > $\mathrm{with}\left(\mathrm{Units}\right):$
 > $\mathrm{AddSystem}\left('\mathrm{FHF}','\mathrm{check}','\mathrm{furlong}','\mathrm{hundredweight}\left[\mathrm{long}\right]','\mathrm{fortnight}'\right)$
 > $\mathrm{UseSystem}\left('\mathrm{FHF}'\right)$
 > $\mathrm{RemoveSystem}\left('\mathrm{FHF}'\right)$
 > $\mathrm{UseSystem}\left('\mathrm{SI}'\right)$
 > $\mathrm{RemoveSystem}\left('\mathrm{FHF}'\right)$
 > $\mathrm{RemoveSystem}\left('\mathrm{SI}'\right)$
 > $\mathrm{RemoveSystem}\left('\mathrm{CGS}'\right)$